Apparatus for trimming and shearing sheet metal



G. H. PERKINS. Apparatusfor Trimming and Shearing Sheet Metal (Model.)

No. 240,176. Patented April 12,1881;

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UNITED STATES PATENT OFFICE.

GEORGE H. PERKINS, OF PHILADELPHIA, PENNSYLVANIA.

APPARATUS FOR TRIMMING AND SHEARING SHEET METAL.

SPECIFICATION forming part of Letters PatentiNo. 240,176, dated April 12,1881.

Application filed March 22, 1880. (ModeL) is fully set forth in the following specification and accompanying drawings, in which- Figure 1 is a side elevation of the apparatus embodying my invention. Fig. 2 is a transverse section in the irregular line :0 m, Fig. 1. Fig. 3 is a side view, enlarged, of a detached portion.

Similar letters of reference indicate correspondin g parts inthe several figures.

This invention relates to rotary devices for trimming sheet metal; and it consists in the construction and combination of parts hereinafter set forth and claimed.

Referring to the drawings, A represents the frame of the trimming and shearing apparatus, B the feed-chute, and 0 an apron, which, in the present case, is adapted to convey sheets of metal to the cutters or shears D D. The cutters of each side consist of two rotary disks, a a, each secured to a shaft, b b, which is passed through a sleeve externally screwthreaded, the shaft being retained in position by a nut, b. One of the sleeves, E, is fitted to a block, F, which is connected to the inner side of the frame A by means of screws'c, and the other sleeve, E, is inserted through a slot, d, in the block F, and fitted to a block, G, hinged to said block F, and adjustable by means of the tightenin g-screw e, which is passed through a segmental slot, f, in said block F, so that the shaft 1) may be brought nearer to or farther from the shaft b, and thus correspondingly adjust the cutters a a.

By turning the sleeves E E of each side the relative cutters a a may be adjusted laterally to and from each other and from the apron or device which feeds the sheets to the cutters,

so that said sheet-s may be out true and uni- 5 form, and provision is made for adjusting the cutters as they become worn in service.

. By unloosing the screws 0 the blocks F and connected parts are detached from the frame A, and may be removed through openings g in the frame A without disturbing other parts of the apparatus, and the cutters or shears may be repaired, replaced, &c.

The disk to is recessed, forming a flange, a, and the disk a is recessed, forming a flange, a, the two flanges being in contact. The disk or is cylindrical, and the disk at is conical, whereby, while the disk serves as the feeder and the disk at the cutter proper, as cuttingedges wear away, new sharp edges are presented, and thus the cutters may be said to be self-sharpening.

' Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is- 6 1. In combination with a pair of self-sharpening cutters and the shafts thereof, a pair of externally screw-threaded sleeves surrounding said shafts, and a pair of adjusting-nuts arranged on said sleeves, for the purpose of ad- 7c justing said cutters edge to edge, to take up wear and keep them self-sharpening.

2. The cutters or shears a a! and sleeves E E, in combination with the blocks F and adjustable blocks G, substantially as and for the purpose set forth.

3. The cutter-supporting blocks F, removably attached to the frame A, and provided with segmental slots f, substantially as and for the purpose set forth.

GEORGE H. PERKINS.

Witnesses:

JOHN A. WIEDERSHEIM, A. P. GRANT. 

